[PATCH] ARM: fix VCVT decoding when UNDEF

[Tim Northover]

> This patch fixes the decoding of VCVT, which reports UNPREDICTABLE
> instead of UNDEFINED.
> A.8.8.307 VCVT (between floating-point and fixed-point, Advanced SIMD):
> if imm6 IN "0xxxxx" then UNDEFINED;

Looks good to me. Should I commit this one or do you have access yet?
If you don't it might be worth asking for it since you seem to be
doing quite a few changes recently.

Cheers.

Tim.